Animated metaballs didn't update correctly when changing frame, this when
they were parented (for example) to an object with Ipo.
The fix consists of three things:
- the test_displist() call doesn't remake displist anymore, but frees it.
this works, because when drawing an mball object it checks for a displist
and creates one when needed
- the main drawing routine drawview3d() now has a separate loop where first
all objects are updated with where_is_object(), then they're drawn.
This effectively solves lag for mballs. Might improve other lags too!
- included in NumPad-9 call to test_displist() too, to force a full upgraded
3d view
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